212400123 has 16 divisors (see below), whose sum is σ = 305249280. Its totient is φ = 130594464.

The previous prime is 212400113. The next prime is 212400157. The reversal of 212400123 is 321004212.

It is not a de Polignac number, because 212400123 - 2¹⁷ = 212269051 is a prime.

It is a super-2 number, since 2×212400123² = 90227624500830258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212400103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76758 + ... + 79476.

It is an arithmetic number, because the mean of its divisors is an integer number (19078080).

Almost surely, 2^212400123 is an apocalyptic number.

212400123 is a deficient number, since it is larger than the sum of its proper divisors (92849157).

212400123 is a wasteful number, since it uses less digits than its factorization.

212400123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 212400123 is about 14573.9535816470. The cubic root of 212400123 is about 596.6480899237.

Adding to 212400123 its reverse (321004212), we get a palindrome (533404335).

The spelling of 212400123 in words is "two hundred twelve million, four hundred thousand, one hundred twenty-three".